Home / 645,501.12-890,778.12-355,100.48

Finding the Fourth Proportional to 645,501.12, 890,778.12 and 355,100.48

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Solution

The fourth proportional to 645,501.12, 890,778.12 and 355,100.48 is: 490,031.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,501.12 : 890,778.12 = 355,100.48 : x
  2. Step 2: Convert to fraction form
    645,501.12/890,778.12 = 355,100.48/x
  3. Step 3: Cross multiply
    645,501.12x = 890,778.12 × 355,100.48
  4. Step 4: Simplify right side
    645,501.12x = 316,315,737,985.50
  5. Step 5: Solve for x
    x = 316,315,737,985.50/645,501.12
  6. Step 6: Final answer
    x = 490,031.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.